Add support for scrollbars in TextAreas

[LauLauThom]

Add a new method signature addTextAreas(String text1, String text2, int rows, int columns, int scrollbars) to the GenericDialog class, which allows adding scrollbars to the TextAreas.

The former addTextAreas(String text1, String text2, int rows, int columns) will call the default NO_SCROLLBARS for backward compatibility.

I have some plugins with these kind of text area to paste a custom macro code, which can be a bit lengthy.
Currently browsing the code is via the up/down arrows only, this would add support for scrolling with the mouse.

Example in jython

from ij.gui import GenericDialog
from java.awt import TextArea

dialog = GenericDialog("Test") 
dialog.addTextAreas("Some input", "Test", 10, 20, TextArea.SCROLLBARS_VERTICAL_ONLY)
dialog.showDialog()

Huge image sorry..

[LauLauThom]

Hello Wayne @rasband,
Any thoughts about this possible contribution ?

[rasband]

The ImageJ 1.53j21 daily build adds support for scrollbars in TextAreas. Append "SCROLLBARS_VERTICAL_ONLY" to the default text of the first TextArea to get vertical scrollbars and "SCROLLBARS_BOTH" to get both vertical and horizontal scrollbars. Here is a JavaScript example:

dialog = new GenericDialog("Test") 
text1 =  "Some input" + "SCROLLBARS_VERTICAL_ONLY"
text2 = "test"
dialog.addTextAreas(text1, text2, 10, 20)
dialog.showDialog()